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Project Introduction

PC Krause and Associates is partnering with Purdue University, EleQuant, and GridQuant to create a hybrid modeling capability. The combination of PCKA�s extensive dynamic modeling experience, Purdue�s work in electromechanical systems analysis, and GridQuant and Elequant�s development of the HELM algorithm uniquely positions the team to create this technology. HELM is a novel algorithm that solves the powerflow equations of electric power systems using a direct, constructive procedure. It was originally derived for terrestrial power grids and is now being applied to dc spacecraft power systems. The Phase I effort will focus on three technical objectives. The first is to provide a formal definition of the mathematical framework for the hybrid modeling capability. The second objective is to define a software architecture for its implementation. Lastly, the third objective is to demonstrate the capability on an aircraft electrical propulsion system. The test system is anticipated to be a variable-voltage/variable-frequency ac electrical propulsion system that PCKA is currently investigating with NASA as part of a Convergent Aeronautics Solutions (CAS) effort. Another alternative is the Hybrid Gas Electric Propulsion (HGEP) Project�s NASA Electric Aircraft Testbed (NEAT) system, which PCKA is also currently modeling. Some potential applications for this modeling technique include some of these applications include 1) efficient contingency analysis, 2) model-based control, 3) system identification and monitoring, and 4) analysis of pulsed loads.
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Anticipated Benefits

Potential NASA Commercial Applications: The most immediate NASA applications for this technology are the NASA�s CAS and NEAT programs. While one will likely be selected as the testbed system for the Phase I, the other is similar in nature, and PCKA has existing models for both systems, which would ease transition of the modeling capability. The technique could also be applied to the Exploration Augmentation Module or International Space Station power systems, both of which are dc systems based on solar arrays with battery energy storage. These systems were modeled by PCKA under a prior NASA SBIR Phase II effort. In short, the proposed modeling technique is applicable to a wide range of electrical power systems and could be applied to virtually any NASA spacecraft or aircraft design. As the technology matures, its mathematical origin would allow it to be applied to other types of dynamic systems as well.
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